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Gibbs Free Energy from Enthalpy and Entropy Calculator

ΔG = ΔH − TΔS; spontaneous if ΔG < 0.

Calculates the Gibbs free energy change ΔG and equilibrium constant K from enthalpy (ΔH in kJ/mol), entropy (ΔS in J/mol·K), and temperature.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

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Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

ΔG = ΔH − T·ΔS; K = exp(−ΔG × 1000 / (R·T)); R = 8.314 J/mol·K

In depth

Calculates the Gibbs free energy change ΔG and equilibrium constant K from enthalpy (ΔH in kJ/mol), entropy (ΔS in J/mol·K), and temperature.